A prefix is a morpheme that cannot stand alone, but rather must be prepended to a base, other prefix or suffix. The new element has a meaning that is similar to the meaning of the base but influenced by the prefix.

Prefixes are used in limited cases for terms that cannot easily be made into roots. This allows them to combine with other bases by direct concatenation rather than by conjunction using the prefixial morpheme #i+. The meaning of a prefix is almost always abstract.

A prefix is represented as a series of letters terminated with a plus sign ("+"). Note that any normal base can become a prefix by attaching #i+.